The Soviet Union’s secret interceptor that defined the high-stakes skies of the Cold War

Wars & Conflicts · Published 15 October 2026 · Updated 25 October 2026 Swipe more like this →

In short: The Sukhoi Su-15 was a formidable supersonic interceptor designed to neutralize Western bombers. Never exported, this twin-engine machine served as the backbone of Soviet air defense for decades. Its history is marked by high-altitude performance, sophisticated radar, and several controversial encounters with foreign aircraft that breached Soviet airspace.

Developed by the Sukhoi OKB to replace the aging Su-9 and Su-11, the Su-15 was engineered specifically to counter high-subsonic threats like the American B-52 Stratofortress. Officially commissioned on 3 April 1965, the aircraft featured a twin-engine layout and side-mounted intake ramps, a significant departure from the nose-intake designs of its predecessors. This configuration provided the necessary space for powerful search radars, such as the RP-22 Oryol-D, allowing the Su-15 to operate effectively as a high-altitude interceptor. With a maximum speed of Mach 2.5 and a rapid climb rate of 228 m/s, it was built for speed and precision rather than versatility.

The Su-15’s operational life was defined by its reliance on ground control interception. Pilots were vectored toward targets by ground radar stations, using a datalink system to receive instructions. Later variants, like the Su-15TM introduced in 1971, featured the Taifun-M radar and automated control systems that allowed for hands-off interceptions. Despite these advancements, the platform lacked look-down/shoot-down capability, a limitation that became critical as NATO shifted toward low-level penetration tactics. This deficiency eventually led to the aircraft's gradual replacement by the MiG-23, though the Su-15 remained a front-line asset until the Soviet Union's collapse.

Beyond its defensive role, the Su-15 is remembered for its involvement in several high-profile international incidents. In 1978, an Su-15 intercepted Korean Air Lines Flight 902, causing a forced landing that resulted in two fatalities. In 1981, an Su-15 collided with a cargo plane over Soviet territory, and in 1983, an Su-15TM fired upon Korean Air Lines Flight 007, leading to the loss of 269 lives. These events underscored the intense, often volatile nature of Cold War airspace enforcement. Following the 1991 breakup of the Soviet Union, the Su-15 was rapidly retired, with the Russian Air Force withdrawing the type from service in 1994 to comply with international arms treaties.

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